Metal–plastics
adhesion has received much attention from
researchers due to its potential use in various industrial applications.
However, the adhesion of plastics with metals is poor due to the low
surface energy of plastics. Accordingly, the adhesion of plastics
usually requires surface modification or the use of an adhesive primer.
Recently, we developed a polymer surface modification method using
the light-activated chlorine dioxide (ClO2
•) radical as oxidant. In this study, we investigated the adhesion
behavior of PP film modified by this method. Improvements in hydrophilicity
and adhesion property of PP were observed after oxidation. The oxidized
PP film exhibited good adhesive properties with Al plate without any
adhesives, and the adhesion strength could be further enhanced by
increasing the oxidation temperature. Moreover, this study successfully
developed an approach for the electroless metal plating on polymer
surfaces. In addition, we also found that light irradiation only activated
ClO2
• but had no direct modification
on plastics.
A highly oriented film was fabricated by layer-by-layer self-assembly of DNA and MgAl-layered double hydroxide nanosheets, and its application in chiroptical switch was demonstrated via intercalation and deintercalation of an achiral molecule into the DNA cavity. DNA molecules are prone to forming an ordered and dispersive state in the interlayer region of rigid layered double hydroxide (LDH) nanosheets as confirmed by scanning electron microscopy and atomic force microscopy. The induced chiroptical ultrathin film (UTF) is achieved via the intercalation of an achiral chromophore [5,10,15,20-tetrakis(4-N-methylpyridyl)porphine tetra(p-toluenesulfonate) (TMPyP)] into the spiral cavity of DNA stabilized in the LDH matrix [denoted as TMPyP-(DNA/LDH)20]. Fluorescence and circular dichroism spectroscopy are utilized to testify the intercalation of TMPyP into (DNA/LDH)20 UTF that involves two steps: the electrostatic binding of TMPyP onto the surface of (DNA/LDH)20 followed by intercalation into base pairs of DNA. In addition, the TMPyP-(DNA/LDH)20 UTF exhibits good reversibility and repeatability in induced optical chirality, based on the intercalation and deintercalation of TMPyP by alternate exposure to HCl and NH3/H2O vapor, which can be potentially used as a chiroptical switch in data storage.
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